Introduction
KF (QF) to Welch Pump Adapters provide a reliable and convenient interface between ISO-KF (Quick Flange) vacuum systems and Welch vacuum pumps. These adapters are designed to simplify pump integration, enabling fast, leak-tight connections without modifying existing equipment. They are widely used in laboratories, semiconductor tools, and industrial vacuum setups where compatibility, cleanliness, and ease of installation are essential.
Detailed Description
Welch vacuum pumps are commonly equipped with proprietary inlet connections or threaded ports, while many modern vacuum systems rely on standardized ISO-KF flanges. KF (QF) to Welch Pump Adapters bridge this gap by converting the pump inlet to a KF-compatible interface.
The KF side connects using a standard centering ring, elastomer O-ring, and clamp, allowing tool-free assembly and quick disconnection. The Welch pump side is precision-machined to match specific pump inlet geometries, ensuring a secure mechanical fit and reliable vacuum sealing. This design minimizes leak paths, reduces installation time, and allows pumps to be easily swapped or serviced.
Adapters are typically manufactured from stainless steel or aluminum. Stainless steel versions offer superior corrosion resistance, mechanical strength, and vacuum cleanliness, while aluminum adapters provide lightweight handling and cost efficiency. Smooth internal surfaces help maintain good conductance and reduce turbulence in the foreline.
Applications
KF (QF) to Welch Pump Adapters are commonly used in:
Rough and medium vacuum systems
Welch rotary vane and dry vacuum pumps
Laboratory vacuum stations
Thin film deposition and coating equipment
Leak detection and vacuum diagnostics
Temporary or modular vacuum setups
Technical Parameters
| Parameter | Typical Value / Range | Importance |
|---|---|---|
| Flange Standard | KF16 / KF25 / KF40 / KF50 | Ensures ISO-KF system compatibility |
| Pump Interface | Welch pump inlet (model-specific) | Guarantees proper mechanical fit |
| Material | 304 / 316L Stainless Steel, Aluminum | Determines durability and cleanliness |
| Sealing Method | KF centering ring with O-ring | Enables quick, reliable sealing |
| Operating Pressure | Atmosphere to ~10⁻³ mbar | Suitable for foreline applications |
| Temperature | Limited by O-ring material | Defines safe operating range |
Comparison with Related Adapters
| Adapter Type | Key Advantage | Typical Application |
|---|---|---|
| KF (QF) to Welch Pump Adapter | Direct pump compatibility | Welch pump forelines |
| KF to Hose Nozzle | Flexible hose connection | Temporary vacuum lines |
| KF to Threaded Adapter | Threaded port conversion | Instrument connections |
FAQ
| Question | Answer |
|---|---|
| Are KF and QF the same standard? | Yes, KF and QF are commonly used interchangeably for ISO-KF flanges. |
| Do I need a clamp and centering ring? | Yes, standard KF hardware is required on the flange side. |
| Are adapters specific to pump models? | Yes, the Welch side is typically matched to specific pump inlets. |
| Can custom adapters be supplied? | Yes, custom dimensions and configurations are available. |
| Is this suitable for high vacuum? | These adapters are mainly used for rough and medium vacuum forelines. |
Packaging
Each KF (QF) to Welch Pump Adapter is cleaned, capped, and individually packaged to prevent contamination. Protective cushioning and clear labeling ensure safe transportation and easy identification.
Conclusion
KF (QF) to Welch Pump Adapters offer a practical and dependable solution for integrating Welch vacuum pumps into ISO-KF vacuum systems. With quick-connect installation, reliable sealing, and multiple material options, these adapters simplify system setup and improve flexibility in laboratory and industrial vacuum applications.
For detailed specifications and a quotation, please contact us at sales@thinfilmmaterials.com.
Ordering Table
| Flange Size/OD | Type | Drawing | Thread Size | Fitting | Part Number |
| KF16 (1.18" OD) | New-Style |
| 3/4-20 | Welch: 1399, 1400, 1405 (Old Style) | QF16-075-W1N |
| KF16 (1.18" OD) | Old-Style |
| 5/8-18 | Welch: 1399, 1400, 1410 | QF16-075-WP1 |
| KF16 (1.18" OD) | Old-Style |
| 3/4-20 | Welch: 1405 | QF16-075-WP2 |
| KF25 (1.57" OD) | New-Style |
| 1-20 | Welch: 1373, 1376, 1380, 1402, 1405 | QF25-100-W1N |
| KF25 (1.57" OD) | Old-Style |
| 1-20 | Welch: 1380, 1402, 1403, 8806, 8811, 8816, 8821 | QF25-100-WP1 |
| KF40 (2.16" OD) | New-Style |
| 1-3/4-20 | Welch: 1397 | QF40-150-W2N |
| KF40 (2.16" OD) | Old-Style |
| 1-1/2-20 | Welch: 1373, 1376, 8831 | QF40-150-WP1 |
| KF40 (2.16" OD) | Old-Style |
| 1-3/4-20 | Welch: 1374, 1397, 8851 | QF40-150-WP2 |
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